It’s just one variant of salmonella:
A distinction is made between enteritis Salmonella and Salmonella typhoid/paratyphoid Salmonella, where the latter—because of a special virulence factor and a capsule protein (virulence antigen)—can cause serious illness, such as Salmonella enterica subsp. enterica serovar Typhi. Salmonella typhi. is adapted to humans and does not occur in other animals.
Beat me to it.